On the back of that, Susie started an interesting thread in which it became apparent that people have very different assumptions. She, and Marc Jones, and others, were assuming that if you don’t tell people not to tweet, then they’ll know not to. Meanwhile, I, and Björn Brembs, and others were assuming the opposite: unless someone says not to tweet, you’re good to go.

Obviously this state of affairs is a recipe for disaster. We’re all going to find ourselves giving presentations where we assume the audience will be doing one thing, but at least some audience members are assuming the other.